Vulnerability Details CVE-2026-52747
ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Prior to 3.0.16, the multipart/form-data request body parser in libmodsecurity silently removes embedded line breaks from non-file form-field values before exporting them to ARGS and ARGS_POST because src/request_body_processor/multipart.cc overwrites reserved bytes in m_reserve instead of appending the current buffer. This creates a parser differential between ModSecurity and backend applications that preserve line breaks in form fields, allowing rules that inspect ARGS or ARGS_POST to miss payloads whose dangerous syntax depends on a line break. This issue is fixed in version 3.0.16.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.005
EPSS Ranking 36.9%
CVSS Severity
CVSS v3 Score 8.6
References
- https://github.com/owasp-modsecurity/ModSecurity/commit/875504c2758169c41be1ad2f0cc64d896b7815d7
- https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.16
- https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-rcw9-2f5r-7p88
- https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-rcw9-2f5r-7p88
Products affected by CVE-2026-52747
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cpe:2.3:a:owasp:modsecurity:2.0.0
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cpe:2.3:a:owasp:modsecurity:2.0.1
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cpe:2.3:a:owasp:modsecurity:2.0.2
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cpe:2.3:a:owasp:modsecurity:2.0.3
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cpe:2.3:a:owasp:modsecurity:2.0.4
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cpe:2.3:a:owasp:modsecurity:2.1.0
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cpe:2.3:a:owasp:modsecurity:2.1.1
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cpe:2.3:a:owasp:modsecurity:2.1.2
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cpe:2.3:a:owasp:modsecurity:2.1.3
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cpe:2.3:a:owasp:modsecurity:2.1.4
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cpe:2.3:a:owasp:modsecurity:2.1.5
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cpe:2.3:a:owasp:modsecurity:2.1.6
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cpe:2.3:a:owasp:modsecurity:2.1.7
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cpe:2.3:a:owasp:modsecurity:2.2.0
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cpe:2.3:a:owasp:modsecurity:2.5.0
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cpe:2.3:a:owasp:modsecurity:2.5.1
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cpe:2.3:a:owasp:modsecurity:2.5.10
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cpe:2.3:a:owasp:modsecurity:2.5.11
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cpe:2.3:a:owasp:modsecurity:2.5.12
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cpe:2.3:a:owasp:modsecurity:2.5.13
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cpe:2.3:a:owasp:modsecurity:2.5.2
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cpe:2.3:a:owasp:modsecurity:2.5.3
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cpe:2.3:a:owasp:modsecurity:2.5.4
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cpe:2.3:a:owasp:modsecurity:2.5.5
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cpe:2.3:a:owasp:modsecurity:2.5.6
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cpe:2.3:a:owasp:modsecurity:2.5.7
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cpe:2.3:a:owasp:modsecurity:2.5.8
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cpe:2.3:a:owasp:modsecurity:2.5.9
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cpe:2.3:a:owasp:modsecurity:2.6.0
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cpe:2.3:a:owasp:modsecurity:2.6.1
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cpe:2.3:a:owasp:modsecurity:2.6.2
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cpe:2.3:a:owasp:modsecurity:2.6.3
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cpe:2.3:a:owasp:modsecurity:2.6.4
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cpe:2.3:a:owasp:modsecurity:2.6.5
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cpe:2.3:a:owasp:modsecurity:2.6.6
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cpe:2.3:a:owasp:modsecurity:2.6.7
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cpe:2.3:a:owasp:modsecurity:2.6.8
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cpe:2.3:a:owasp:modsecurity:2.7.0
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cpe:2.3:a:owasp:modsecurity:2.7.1
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cpe:2.3:a:owasp:modsecurity:2.7.2
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cpe:2.3:a:owasp:modsecurity:2.7.3
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cpe:2.3:a:owasp:modsecurity:2.7.4
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cpe:2.3:a:owasp:modsecurity:2.7.5
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cpe:2.3:a:owasp:modsecurity:2.7.6
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cpe:2.3:a:owasp:modsecurity:2.7.7
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cpe:2.3:a:owasp:modsecurity:2.8.0
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cpe:2.3:a:owasp:modsecurity:2.9.0
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cpe:2.3:a:owasp:modsecurity:2.9.1
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cpe:2.3:a:owasp:modsecurity:2.9.10
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cpe:2.3:a:owasp:modsecurity:2.9.11
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cpe:2.3:a:owasp:modsecurity:2.9.12
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cpe:2.3:a:owasp:modsecurity:2.9.2
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cpe:2.3:a:owasp:modsecurity:2.9.3
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cpe:2.3:a:owasp:modsecurity:2.9.4
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cpe:2.3:a:owasp:modsecurity:2.9.5
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cpe:2.3:a:owasp:modsecurity:2.9.6
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cpe:2.3:a:owasp:modsecurity:2.9.7
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cpe:2.3:a:owasp:modsecurity:2.9.8
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cpe:2.3:a:owasp:modsecurity:2.9.9
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cpe:2.3:a:owasp:modsecurity:3.0.0
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cpe:2.3:a:owasp:modsecurity:3.0.1
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cpe:2.3:a:owasp:modsecurity:3.0.10
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cpe:2.3:a:owasp:modsecurity:3.0.11
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cpe:2.3:a:owasp:modsecurity:3.0.12
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cpe:2.3:a:owasp:modsecurity:3.0.13
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cpe:2.3:a:owasp:modsecurity:3.0.14
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cpe:2.3:a:owasp:modsecurity:3.0.2
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cpe:2.3:a:owasp:modsecurity:3.0.3
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cpe:2.3:a:owasp:modsecurity:3.0.4
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cpe:2.3:a:owasp:modsecurity:3.0.5
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cpe:2.3:a:owasp:modsecurity:3.0.6
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cpe:2.3:a:owasp:modsecurity:3.0.8
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cpe:2.3:a:owasp:modsecurity:3.0.9